Re-impl CryptoHelper's EncryptMessage & DecryptMessage

[eanzhao]

Via BouncyCastle

Related Issue: #3563

[codecov]

Codecov Report

Attention: Patch coverage is 66.03774% with 18 lines in your changes missing coverage. Please review.

Project coverage is 90.62%. Comparing base (8dfa973) to head (2fb5acd).

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #3564      +/-   ##
==========================================
- Coverage   90.72%   90.62%   -0.11%     
==========================================
  Files         668      668              
  Lines       25941    25972      +31     
  Branches     2325     2327       +2     
==========================================
+ Hits        23535    23537       +2     
- Misses       2290     2320      +30     
+ Partials      116      115       -1     

Files	Coverage Δ
src/AElf.Cryptography/CryptoHelper.cs	88.72% <100.00%> (+2.32%)	⬆️
...EDPoS/AEDPoSContract_GetConsensusBlockExtraData.cs	77.85% <0.00%> (-5.71%)	⬇️
...DPoS/AEDPoSContract_ProcessConsensusInformation.cs	80.70% <0.00%> (-3.75%)	⬇️
...s.Consensus.AEDPoS/AEDPoSContract_SecretSharing.cs	45.45% <41.17%> (-2.70%)	⬇️

... and 1 file with indirect coverage changes